In the field of solid-liquid separation, when the processing scale and automation requirements are high, the chamber diaphragm filter press is favored for its secondary extrusion process and intelligent control; in the case of small batches or limited budgets, the plate and frame filter press with simple structure and easy maintenance is still the best choice.
Taking the Indonesian municipal sludge treatment project as an example, the chamber diaphragm filter press quickly reduced the moisture content of the filter cake from 70% to 37% by injecting compression medium, which not only shortened the cake unloading cycle by about 40%, but also saved the company nearly 12% of annual operating costs.
The principle of the plate and frame filter press is to rely on high pressure to evenly distribute the material between the filter plate and the filter cloth. After the filter cake is formed, it needs to be removed manually or mechanically. The chamber diaphragm filter press can inject air and pressurize after the initial filter cake is formed, so that the residual water evaporates again, thereby achieving an additional dehydration effect of up to 30%.
Structural comparison shows that the plate-and-frame filter is only composed of filter plates, filter cloths and filter frames; while the chamber-type membrane filter is equipped with an inflatable membrane ring and a hydraulic push plate system. The automated cake unloading function can reduce downtime by an average of 25%.
From an application perspective, when the processing capacity exceeds 20m³/h or the sludge solid content is ≥25%, it is recommended to choose a chamber-type membrane filter; for small batch requirements of ≤10m³/h, the plate-and-frame filter is more competitive due to its low investment and easy maintenance.
Economic analysis shows that the chamber-type membrane filter has obvious advantages in power consumption, labor and equipment downtime losses; although the initial investment of the plate-and-frame filter is low, its labor and maintenance costs will increase significantly when it is operated in large quantities.
In summary, users should combine key indicators such as processing capacity, target solid content and budget, and quickly screen out the most suitable filter type through the two dimensions of “automation level + capacity demand” to ensure that the equipment is highly matched with the working conditions.
